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<h2><a name="SECTION0021420000000000000000"></a><a name="au-write-objects"></a>
<br>
19.4.2 AU_write Objects 
</h2>

<p>
AU_write objects, as returned by <tt class="function">open()</tt> above, have the
following methods:

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4592' xml:id='l2h-4592' class="method">setnchannels</tt></b>(</nobr></td>
  <td><var>n</var>)</td></tr></table></dt>
<dd>
Set the number of channels.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4593' xml:id='l2h-4593' class="method">setsampwidth</tt></b>(</nobr></td>
  <td><var>n</var>)</td></tr></table></dt>
<dd>
Set the sample width (in bytes.)
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4594' xml:id='l2h-4594' class="method">setframerate</tt></b>(</nobr></td>
  <td><var>n</var>)</td></tr></table></dt>
<dd>
Set the frame rate.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4595' xml:id='l2h-4595' class="method">setnframes</tt></b>(</nobr></td>
  <td><var>n</var>)</td></tr></table></dt>
<dd>
Set the number of frames. This can be later changed, when and if more 
frames are written.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4596' xml:id='l2h-4596' class="method">setcomptype</tt></b>(</nobr></td>
  <td><var>type, name</var>)</td></tr></table></dt>
<dd>
Set the compression type and description.
Only <code>'NONE'</code> and <code>'ULAW'</code> are supported on output.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4597' xml:id='l2h-4597' class="method">setparams</tt></b>(</nobr></td>
  <td><var>tuple</var>)</td></tr></table></dt>
<dd>
The <var>tuple</var> should be <code>(<var>nchannels</var>, <var>sampwidth</var>,
<var>framerate</var>, <var>nframes</var>, <var>comptype</var>, <var>compname</var>)</code>, with
values valid for the <tt class="method">set*()</tt> methods.  Set all parameters.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4598' xml:id='l2h-4598' class="method">tell</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Return current position in the file, with the same disclaimer for
the <tt class="method">AU_read.tell()</tt> and <tt class="method">AU_read.setpos()</tt> methods.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4599' xml:id='l2h-4599' class="method">writeframesraw</tt></b>(</nobr></td>
  <td><var>data</var>)</td></tr></table></dt>
<dd>
Write audio frames, without correcting <var>nframes</var>.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4600' xml:id='l2h-4600' class="method">writeframes</tt></b>(</nobr></td>
  <td><var>data</var>)</td></tr></table></dt>
<dd>
Write audio frames and make sure <var>nframes</var> is correct.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4601' xml:id='l2h-4601' class="method">close</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Make sure <var>nframes</var> is correct, and close the file.

<p>
This method is called upon deletion.
</dl>

<p>
Note that it is invalid to set any parameters after calling 
<tt class="method">writeframes()</tt> or <tt class="method">writeframesraw()</tt>. 

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